var t = n =0, count;

$(document).ready(function(){
    count=$("#banner_list a").length;
    $("#banner_list a:not(:first-child)").hide();
    $("#banner_info").html($("#banner_list a:first-child").find("img").attr('title'));
    $("#banner_info").click(function(){
        window.open($("#banner_list a:first-child").attr('href'), "_blank")
    });
    $("#banner li").click(function() {
        var i = $(this).val() -1;//获取Li元素内的值，即1，2，3，4
        n = i;
        if (i >= count)
            return;
        $("#banner_info").html($("#banner_list a").eq(i).find("img").attr('alt'));
        $("#banner_info").unbind().click(function(){window.open($("#banner_list a").eq(i).attr('href'), "_blank")})
        $("#banner_list a").filter(":visible").fadeOut(500).parent().children().eq(i).fadeIn(1000);
        document.getElementById("banner").style.background="";
        $(this).toggleClass("on");
        $(this).siblings().removeAttr("class");
    });
    t = setInterval("showAuto()", 2000);
    $("#banner").hover(function(){clearInterval(t)}, function(){t = setInterval("showAuto()", 4000);});
})
function showAuto()
{
    n = n >=(count -1) ?0 : ++n;
    $("#banner li").eq(n).trigger('click');
}
